Advanced Applied Geology

Advanced Applied Geology

Investigating the diverse depositional environments in the Aghajari Formation in a part of the Bibi Hakimeh oil field.

Author
Operation geology division NISOC
Abstract
The Aghajari detrital Formation with the age of the Miocene-Pliocene is the thickest formation deposited in the Zagros sedimentary basin, which consists of marl, siltstone and sandstone lithofacies. The main depositional environments considered for this formation in most parts of the Zagros sedimentary basin, especially in the northern and central areas of the Dezful embayment, are fluvial environments. In parts of the southern areas of the Dezful embayment, in vicinity of the Persian Gulf shorelines, a marine depositional environment has also been mentioned for this formation, but not many studies have been conducted in this regard. In the study area, which is located in parts of the southeast of the Bibi Hakimeh oil field, the Aghajari Formation contains thin layers of limestone and anhydrite in addition to sandstone and marl. According to the various identified lithofacies and biofacies in the study area, such as evaporite lithofacies including nodular gypsum and anhydrite, plant biofacies or peat layer, carbonate Charophyte algal facies, oyster reef facies, carbonate foraminifera facies, and carbonate ostracoda facies, other depositional environments such as lacustrine, shallow marine, and probable transitional environments such as salt marshes and estuarine environments can be considered for the Aghajari Formation. In the study area, the Aghajari Formation contains a diverse and rich fossilized biota of different genera and species of plants, Charophyte algae, oysters, bivalves, gastropods, benthic foraminifera and ostracods.
Keywords
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